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The effect of precursor composition and sintering additives on the formation of ß-sialon from Al, Si and Al2O3 powders

Ewing, Helen and Yang, S. (2011) The effect of precursor composition and sintering additives on the formation of ß-sialon from Al, Si and Al2O3 powders. Ceramics International, 37 (5). pp. 1667-1673. ISSN 0272-8842

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    Abstract

    A study was performed to investigate the effect of increasing the Al or Al2O3 precursor content, above the stoichiometric amount, on the formation of β-sialon by pressureless sintering of Al, Si and Al2O3 powders in flowing nitrogen gas. The effect of adding Y2O3 or Fe to the precursor mixture, on the β-sialon formation, was also studied. The phase morphology and yield produced by the various compositions were examined using X-ray diffraction (XRD). Additional Al2O3 decreases the β-sialon phase yield and results in a greater amount of Al2O3 in the final sintered material. Additional Al improved the conversion to β-sialon up to a maximum of 4 wt% Al beyond which the β-sialon:15R sialon ratio in the sintered material decreases. 1 wt% Y2O3 was determined to be the optimum sintering additive content, as yttrium aluminium garnet (YAG) was found to be present in materials formed from higher Y2O3 containing precursors. The presence of Fe in the precursor powder retards the formation of β-sialon by preferentially forming Fe silicides at low temperatures, thus depleting the reaction system of elemental Si, favouring the formation of 15R sialon.

    Item type: Article
    ID code: 30842
    Keywords: sintering, refractories, Sialon, ceramics, Mechanical engineering and machinery, Mining engineering. Metallurgy, Materials Chemistry, Surfaces, Coatings and Films, Ceramics and Composites, Process Chemistry and Technology, Electronic, Optical and Magnetic Materials
    Subjects: Technology > Mechanical engineering and machinery
    Technology > Mining engineering. Metallurgy
    Department: Faculty of Engineering > Mechanical and Aerospace Engineering
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    Depositing user: Pure Administrator
    Date Deposited: 05 May 2011 15:15
    Last modified: 27 Mar 2014 11:25
    URI: http://strathprints.strath.ac.uk/id/eprint/30842

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